WO2005064146A1 - Protective housing for an injection system - Google Patents

Protective housing for an injection system Download PDF

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Publication number
WO2005064146A1
WO2005064146A1 PCT/FR2004/050692 FR2004050692W WO2005064146A1 WO 2005064146 A1 WO2005064146 A1 WO 2005064146A1 FR 2004050692 W FR2004050692 W FR 2004050692W WO 2005064146 A1 WO2005064146 A1 WO 2005064146A1
Authority
WO
WIPO (PCT)
Prior art keywords
cylinder head
injection
protective housing
recuperator
cover
Prior art date
Application number
PCT/FR2004/050692
Other languages
French (fr)
Inventor
Eddie Centoni
Sabine Lavagne D'ortigue
Original Assignee
Renault S.A.S.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renault S.A.S. filed Critical Renault S.A.S.
Priority to DE602004025850T priority Critical patent/DE602004025850D1/en
Priority to AT04816546T priority patent/ATE459799T1/en
Priority to EP04816546A priority patent/EP1700027B1/en
Publication of WO2005064146A1 publication Critical patent/WO2005064146A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/002—Arrangement of leakage or drain conduits in or from injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/006—Camshaft or pushrod housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • the present invention relates to a protective housing for an internal combustion engine injection system intended for motor vehicles.
  • Injection systems for motor vehicles are generally mounted at the top of the engine, which has cylinders closed by a cylinder head. Each cylinder comprises a piston, the upper surface of which forms a combustion chamber with the cylinder head.
  • the fuel is injected into the combustion chamber by means of injectors.
  • the injection systems include an injection rail mounted on the cylinder head of the engine and situated between an injection pump and the injectors.
  • the injection manifold is supplied with fuel under high pressure by the pump and is connected to the injectors by pipes. It thus constitutes a reserve of fuel under pressure and the injectors, at a frequency determined as a function of the engine rotation speed, inject the fuel into the combustion chambers.
  • the present invention provides a protective housing for an injection system of an internal combustion engine, said injection system comprising an injection manifold which is supplied by a pump and which is connected by pipes. to injectors mounted in a cylinder head of said engine, said housing comprising a wall whose free lower edges are intended to sealingly join said cylinder head, and said wall being adapted to extend between said injection rail and said cylinder head by covering said pipes and said injectors.
  • a characteristic of the invention resides in the shape of the housing which here no longer includes the injection rail as included in the devices of the prior art, but whose wall extends between the injection rail and the breech.
  • this injection ramp which adjoins the cylinder head occupies a more restricted space since it is no longer covered, and the housing simply covers the pipes and the injectors. Thanks to this more compact assembly, possible leaks on the injection systems on the front of the engines are likely to be confined, which avoids your dispersion of the fuel in the engine trunk.
  • the housing comprises a lower part adapted to form a recuperator and an upper part forming a cover.
  • said lower part defines a first wall portion of said wall of said housing and has said free lower edges, and it extends between said injection rail and said cylinder head.
  • said lower part has passage holes for said conduits and the edge of said passage holes and said ramp are tightly joined by a ramp seal.
  • said cover is removably mounted on said cylinder head and it joins said recuperator in a sealed manner.
  • said cover and said recuperator are adapted to be connected together by snap-fastening, which makes it possible to prevent them from coming apart under the effect of vibrations or shocks and this , by means of a simple and reversible connection.
  • said free lower edges are equipped with a lip seal, which allows the recuperator to be driven in limited movement relative to the cylinder head to which if is applied with said lip seal, without however causing it to lose contact and therefore to keep any sealing of the recuperator on the cylinder head.
  • the housing comprises a discharge pipette opening into a lower part.
  • FIG. 1 is a schematic front view of an internal combustion engine on the front and having a housing according to the invention
  • - Figure 2 is a schematic view in substantially vertical and longitudinal section of the motor illustrated in Figure 1
  • - Figure 3 is a vertical and transverse sectional view along the section Ifi-li shown in Figure 2.
  • Figure 1 shows in front view the upper part of an internal combustion engine 10.
  • This engine has a injection rail 12 which is mounted on a cylinder head 14 thanks to two fixing points 16, 18.
  • it comprises a housing 20 consisting of two parts, a lower part 22 forming a recuperator and an upper part 24 forming a lid.
  • the lower part 22 has a wall portion which extends between the cylinder head 14 and the injection manifold 12 and is covered by the cover 24.
  • FIG. 3 Reference will be made to FIG. 3 to describe in more detail the housing 20 than the 'We find constituted by its lower part 22 and the cover 24.
  • the cylinder head 14 in which extends an injector 26, and the injection manifold 12 which is mounted on the cylinder head 14 through the attachment point 16 which appears here.
  • the cylinder head 14 is covered with a cylinder head cover 28 which extends towards the stop of the engine 10.
  • the lower part 22 has a free lower edge 30 which extends away from a lower part 31 of the said cylinder head 14.
  • a lip seal 32 is mounted on the said lower edge 30 and it seals the cylinder head 14. The lip of the lip seal 32 being elastically deformable, the seal is retained even when the recuperator 22 is driven in displacement, essentially between a close position and a position separated from the cylinder head, obviously within certain limits.
  • the bolt 14 has at least one boss 34 adapted to form the point of attachment 16 and which passes through a recess 36 to the recuperator 22.
  • the edge of this recess 36 is provided at a recuperator * joint 38 which applies tightly around the boss 34.
  • the recuperator 22 has a portion 40 which extends substantially vertically behind the injection ramp 12, between it and the cylinder head 14 then which continues with a support part 42 , substantially perpendicular to said portion 40.
  • the support part 42 is applied to the injection rail 12 and is joined to it by fixing clips not shown.
  • the support part 42 has a flange 44 adapted to cooperate with the cover 24 as will be described below.
  • FIG. 2 corresponding to the section according to the IMI yaw illustrated in Figure 3 and vice versa
  • Figure 3 corresponding to the section along the plane lli-lll illustrated in Figure 2.
  • connections 48 four in number in FIG. 2.
  • the connections are made by means of a nozzle 50 projecting vertically above the rail injection, which end piece has a peripheral thread on which a ring 52 is adapted to be screwed.
  • the end of the pipes 46 is provided with a shoulder against which said ring 52 is adapted to take support in order to force said end into the end piece 50 of the injection rail 12.
  • the support part 42 has holes for passage of the pipes 46 whose edges 54 are adapted to be applied in the periphery of the nozzles 50 against the injection rail 12 and in a sealed manner thanks to a rail seal 56.
  • the rail seal is made in one piece and it extends over the entire length of the part d 'support 42 which it runs along the recuperator 22 and orifices are provided for each. end piece 50.
  • a central end piece 57 for supplying, appearing in FIG. 2 is formed projecting from the injection rail 12 and it is intended to receive a supply duct coming from an injection pump not shown, and external to the housing 20.
  • the cover 24 has a depressed portion, not shown and pierced, the edge of which is applied in a sealed manner around the central tip 57.
  • the central tip 57 is thus connected to the supply line outside said housing 20 with means similar to those of the other lines.
  • the cover 24 has a second free edge 58 which is applied, on the side of the front face, fongitudinally against the rim 44 in leaktight manner thanks to a first cover seal 60 and on the side of the rear face, against the cylinder head cover 28, in leaktight manner thanks to a second cover gasket 62.
  • said second free edge is provided with a single continuous cover gasket, which is wedged between the cover 24 and the recuperator 22 substantially for half , including two parts of side edges not shown where the rim meet
  • the recuperator 22 completely and sealingly isolates the injection ramp 12 from the cylinder head 14 and, on the other hand, the cover 24 completely and also sealingly covers the lines 46 between the flange 44 and cylinder head cover 28.
  • the cover 24 is mounted in a fixed position on the cylinder head cover 28 by screws not shown while the second free edge 58 is provided with lugs 64 also appearing in FIG. 1, adapted to be engaged in the slots 66 elastic tabs 68.
  • the cover 24 and the recuperator 22 are integral with one another and they are adapted to be easily connected to one another.
  • a discharge pipette 70 in a lower side part of the recuperator 22 and which opens into the housing 20 more precisely between the wall of the recuperator 22 and the cylinder head wall. Thanks to this discharge pipette 70, the fuel which escapes from the pipes in liquid form or which is vaporized, is capable of being recovered.
  • any projection of fuel due to leaks is on the one hand contained inside the housing 20 and on the other hand capable of being channeled away from hot parts of the engine. ⁇

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)

Abstract

The invention relates to a protective housing for an injection system of a combustion engine. Said injection system comprises an injection ramp (12) which is fed by a pump and with is connected by means of conduits to injectors (26) which are mounted in a cylinder head (14) of the engine. The housing comprises a wall whose free lower walls (30) are used to join the cylinder head (14) in a tight manner. The wall (24,40) is adapted in such a way that it extends between the injection ramp (12) and the cylinder head (14), covering the conduits (46) and injectors (26).

Description

Boîtier de protection d'un système d'injection Protective housing of an injection system
La présente invention se rapporte à un boîtier de protection pour un système d'injection de moteur à combustion interne destiné aux véhicuies automobiles. Les systèmes d'injection des véhicules automobiles sont généralement montés en partie haute du moteur, lequel comporte des cyiîndres refermés par une culasse. Chaque cylindre comprend un piston dont îa surface supérieure forme avec fa culasse une chambre de combustion. On injecte le carburant dans fa chambre de combustion au moyen d'injecteurs, Les systèmes d'injection comprennent une rampe d'injection montée sur la culasse du moteur et située entre une pompe d'injection et les injecteurs. La rampe d'injection est alimentée sous haute pression en carburant par la pompe et eue est reliée aux injecteurs par des conduites. Elle constitue ainsi une réserve de carburant sous pression et les injecteurs, à une fréquence déterminée en fonction de la vitesse de rotation du moteur, injectent le carburant dans les chambres de combustion. Un inconvénient de ces systèmes d'alimentation réside notamment' dans la nature des raccords des conduites, à ia fois sur fa rampe d'injection et sur les injecteurs. Ces raccords sont généralement vissabîes et ils présentent des risques de fuites. Le carburant provenant de ces fuîtes, liquide ou vaporisé, est susceptible de se répandre dans l'environnement au moteur. Pour prévenir la projection de carburant due aux fuîtes, il a été Imaginé, par exemple dans le document EP 1 172551, de recouvrir complètement le système d'injection avec un boîtier en englobant les injecteurs, les conduites et ïa rampe d'injection. Toutefois, un tel boîtier est fort encombrant et il n'est pas adapté aux moteurs où l'injection est réalisée en face avant pour lesquels l'espace disponible est réduit. Un problème qui se pose et que vise à résoudre la présente invention, est alors de fournir un boîtier qui permette d'éviter les projections de carburant dans l'environnement du moteur et qui ne soit pas trop encombrant. A cet effet, la présente invention propose un boîtier de protection pour un système d'injection d'un moteur à combustion interne, ledit système d'injection comprenant une rampe d'injection qui est alimentée par une pompe et qui est reliée par des conduites à des injecteurs montés dans une culasse dudit moteur, ledit boîtier comportant une paroi dont les bords inférieurs libres sont destinés à joindre de façon étanche ladite culasse, et ladite paroi étant adaptée à s'étendre entre ladite rampe d'injection et ladite culasse en recouvrant lesdites conduites et lesdits injecteurs. Ainsi, une caractéristique de l'invention réside dans la forme du boîtier qui n'englobe plus ici la rampe d'injection comme l'englobait les dispositifs de l'art antérieur, mais dont la paroi s'étend entre la rampe d'injection et la culasse. De la sorte, cette rampe d'injection qui elle, jouxte îa culasse occupe un espace plus restreint puisqu'elle n'est plus recouverte, et le boîtier recouvre simplement les conduites et les injecteurs. Grâce à ce montage plus compact, les fuites éventuelles sur les systèmes d'injection en face avant des moteurs sont susceptibles d'être confinées, ce qui évite ta dispersion du carburant dans le coffre moteur. Selon un mode particulier de mise en œuvre de l'invention, le boîtier comprend une partie inférieure adaptée à former un récupérateur et une partie supérieure formant couvercle. De fa sorte, if est plus aisé à installer sur le moteur ; on installe d'abord fa partie inférieure et la rampe d'injection puis on recouvre le récupérateur avec le couvercle. De façon particulièrement avantageuse, iedit récupérateur est monté flottant en appui sur ladite rampe d'injection, de sorte qu'il n'imprime aucune contrainte au système d'injection et fa rampe d'injection permet de le maintenir par rapport à la culasse. Selon une caractéristique particulière de l'invention, ladite partie inférieure définît une première portion de paroi de ladite paroi dudit boîtier et présente lesdits bords inférieurs libres, et elle s'étend entre ladite rampe d'injection et ladite culasse. Ainsi, au cours du montage, ladite partie inférieure et ladite rampe d'injection sont adaptées à être ajustées ensemble avant d'être montées sur la culasse, ce qui rend le montage plus aisé. Ensuite le couvercle est lui, ajusté sans contact avec la rampe d'injection, directement en joignant le couvercle et la culasse. Selon un mode de réalisation préféré, ladite partie inférieure présente des trous de passage desdîtes conduites et le bord desdits trous de passage et ladite rampe sont joints de façon étanche par un joint de rampe. De la sorte, aucun écoulement de carburant n'est possible entre la partie inférieure et la rampe d'injection de laquelle débouchent les conduites. En outre» et ce de façon particulièrement avantageuse, ledit couvercle est monté de manière amovible sur ladite culasse et il joint ledit récupérateur de façon étanche. Ainsi, le récupérateur en joignant de façon étanche le pourtour des conduites sur la rampe d'injection, et le couvercle joignant la culasse, le récupérateur et le couvercle étant hermétiquementv-reliés ensemble, le carburant provenant d'éventuelles fuites au niveau des conduites est susceptible d'être récupéré. Selon un mode avantageux de mise en œuvre de l'invention, ledit couvercle et ledit récupérateur sont adaptés à être reliés ensemble par enclîquetage, ce qui permet d'éviter qu'ils ne se désolidarisent sous l'effet des vibrations ou des chocs et ce, au moyen d'une liaison simple et réversible. Selon encore un autre mode de mise en œuvre de l'invention lesdits bords inférieurs libres sont équipés d'un joint â lèvre, ce qui permet au récupérateur d'être entraîné en mouvement limité par rapport à la culasse sur laquelle if s'applique avec ledit joint à lèvre, sans pour autant lui faire perdre contact et donc de conserver toute f'êtanchéité du récupérateur sur îa culasse. Par ailleurs, selon encore un mode de réalisation particulier, le boîtier comprend une pipette d'évacuation débouchant dans une partie basse. De la sorte, au moyen d'un conduit de récupération relié à ladite pipette d'évacuation, il est possible de canaliser et de récupérer les produits de fuite pour les éloigner du moteur. D'autres particularités et avantages de l'invention ressortiront à la lecture de la description faite ci-après d'un mode de réalisation particulier de l'invention, donné à titre indicatif mais non limitatif, en référence aux dessins annexés sur lesquels : - la Figure 1 est une vue schématique de face d'un moteur à combustion interne en face avant et présentant un boîtier conforme à l'invention ; - la Figure 2 est une vue schématiqu en coupe sensiblement verticale et longitudinale du moteur illustré sur la Figure 1 ; et, - la Figure 3 est une vue en coupe verticale et transversale selon la coupe Ifi-lli illustrée sur la Figure 2. La Figure 1 montre en vue de face la partie supérieure d'un moteur à combustion interne 10. Ce moteur comporte une rampe d'injection 12 qui est montée sur une culasse 14 grâce à άeux points de fixation 16, 18, En outre, il comprend un boîtier 20 constitué de -deux parties, une partie inférieure 22, formant un récupérateur et une partie supérieure 24 formant un couvercle. La partie inférieure 22 présente une portion de paroi qui s'étend entre la culasse 14 et la rampe d'injection 12 et elle est recouverte par te couvercle 24. On se référera à la Figure 3 pour décrire plus en détail le boîtier 20 que l'on retrouve constitué de sa partie inférieure 22 et du couvercle 24.The present invention relates to a protective housing for an internal combustion engine injection system intended for motor vehicles. Injection systems for motor vehicles are generally mounted at the top of the engine, which has cylinders closed by a cylinder head. Each cylinder comprises a piston, the upper surface of which forms a combustion chamber with the cylinder head. The fuel is injected into the combustion chamber by means of injectors. The injection systems include an injection rail mounted on the cylinder head of the engine and situated between an injection pump and the injectors. The injection manifold is supplied with fuel under high pressure by the pump and is connected to the injectors by pipes. It thus constitutes a reserve of fuel under pressure and the injectors, at a frequency determined as a function of the engine rotation speed, inject the fuel into the combustion chambers. One drawback of these supply systems lies in particular in the nature of the pipe connections, both on the injection rail and on the injectors. These fittings are generally screwed on and there is a risk of leaks. Fuel from these leaks, liquid or vaporized, is likely to spread into the environment around the engine. To prevent the projection of fuel due to leaks, it has been imagined, for example in document EP 1 172551, to completely cover the injection system with a housing including the injectors, the pipes and the injection rail. However, such a box is very bulky and it is not suitable for engines where the injection is carried out on the front face for which the available space is reduced. A problem which arises and which the present invention aims to solve is then to provide a housing which makes it possible to avoid fuel splashes in the environment of the engine and which is not too bulky. To this end, the present invention provides a protective housing for an injection system of an internal combustion engine, said injection system comprising an injection manifold which is supplied by a pump and which is connected by pipes. to injectors mounted in a cylinder head of said engine, said housing comprising a wall whose free lower edges are intended to sealingly join said cylinder head, and said wall being adapted to extend between said injection rail and said cylinder head by covering said pipes and said injectors. Thus, a characteristic of the invention resides in the shape of the housing which here no longer includes the injection rail as included in the devices of the prior art, but whose wall extends between the injection rail and the breech. In this way, this injection ramp which adjoins the cylinder head occupies a more restricted space since it is no longer covered, and the housing simply covers the pipes and the injectors. Thanks to this more compact assembly, possible leaks on the injection systems on the front of the engines are likely to be confined, which avoids your dispersion of the fuel in the engine trunk. According to a particular embodiment of the invention, the housing comprises a lower part adapted to form a recuperator and an upper part forming a cover. So if is easier to install on the engine; first install the lower part and the injection rail and then cover the recuperator with the cover. In a particularly advantageous manner, the recuperator is mounted floating in abutment on said injection rail, so that it imposes no stress on the injection system and the injection rail makes it possible to maintain it relative to the cylinder head. According to a particular characteristic of the invention, said lower part defines a first wall portion of said wall of said housing and has said free lower edges, and it extends between said injection rail and said cylinder head. Thus, during assembly, said lower part and said injection rail are adapted to be adjusted together before being mounted on the cylinder head, which makes assembly easier. Then the cover is him, adjusted without contact with the injection rail, directly by joining the cover and the cylinder head. According to a preferred embodiment, said lower part has passage holes for said conduits and the edge of said passage holes and said ramp are tightly joined by a ramp seal. In this way, no fuel flow is possible between the lower part and the injection rail from which the pipes open. In addition, and this is particularly advantageous, said cover is removably mounted on said cylinder head and it joins said recuperator in a sealed manner. Thus, the recuperator by sealingly joining the periphery of the pipes on the injection manifold, and the cover joining the cylinder head, the recuperator and the cover being hermetically sealed, the fuel coming from possible leaks at the pipes is likely to be recovered. According to an advantageous embodiment of the invention, said cover and said recuperator are adapted to be connected together by snap-fastening, which makes it possible to prevent them from coming apart under the effect of vibrations or shocks and this , by means of a simple and reversible connection. According to yet another embodiment of the invention, said free lower edges are equipped with a lip seal, which allows the recuperator to be driven in limited movement relative to the cylinder head to which if is applied with said lip seal, without however causing it to lose contact and therefore to keep any sealing of the recuperator on the cylinder head. Furthermore, according to another particular embodiment, the housing comprises a discharge pipette opening into a lower part. In this way, by means of a recovery conduit connected to said discharge pipette, it is possible to channel and recover the leakage products to distance them from the engine. Other features and advantages of the invention will emerge on reading the description given below of a particular embodiment of the invention, given by way of indication but not limitation, with reference to the appended drawings in which: - Figure 1 is a schematic front view of an internal combustion engine on the front and having a housing according to the invention; - Figure 2 is a schematic view in substantially vertical and longitudinal section of the motor illustrated in Figure 1; and, - Figure 3 is a vertical and transverse sectional view along the section Ifi-li shown in Figure 2. Figure 1 shows in front view the upper part of an internal combustion engine 10. This engine has a injection rail 12 which is mounted on a cylinder head 14 thanks to two fixing points 16, 18. In addition, it comprises a housing 20 consisting of two parts, a lower part 22 forming a recuperator and an upper part 24 forming a lid. The lower part 22 has a wall portion which extends between the cylinder head 14 and the injection manifold 12 and is covered by the cover 24. Reference will be made to FIG. 3 to describe in more detail the housing 20 than the 'We find constituted by its lower part 22 and the cover 24.
On retrouve également sur cette Figure 3 la culasse 14 dans laquelle s'étend un injecteur 26, et la rampe d'injection 12 qui est montée sur la culasse 14 grâce au point de fixation 16 qui apparaît ici. En outre, la culasse 14 est recouverte d'un couvercle de culasse 28 qui s'étend vers Tanière du moteur 10. La partie inférieure 22 présente un bord inférieur libre 30 qui s'étend à distance d'une partie basse 31 de ladite culasse 14. Un joint à lèvre 32 est monté sur ledit bord Inférieur 30 et il joint de façon étanche la culasse 14. La lèvre du joint à lèvre 32 étant élastiquement défor able, l'étanchéité est conservée même quand Se récupérateur 22 est entraîné en déplacement, essentiellement entre une position rapprochée et une position écartée de la culasse, bien évidemment dans certaines limites. Par ailleurs, la culasse 14 présente au moins un bossage 34 adapté à former le point de fixation 16 et qui traverse un évidement 36 au récupérateur 22. Le bord de cet évidement 36 est muni â*un joint de récupérateur 38 qui s'applique de façon étanche autour du bossage 34. A partir du bossage 34 le récupérateur 22 présente une portion 40 qui s'étend sensiblement verticalement derrière la rampe d'injection 12, entre elle et la culasse 14 puis qui se poursuit par une partie d'appui 42, sensiblement perpendiculaire à ladite portion 40. La partie d'appui 42 s'applique sur la rampe d'injection 12 et y est solidarisée par des clips de fixation non représentés. En outre, la partie d'appui 42 présente un rebord 44 adapté à coopérer avec le couvercle 24 comme on le décrira ci-après. On décrira au préalable, îa coopération de ta partie d'appui 42 avec la rampe- d'injection 12 sur laquelle elle s'appuie, en référence â la Figure 3 et à la Figure 2. La Figure 2 correspondant à la coupe selon le pian IMI illustré sur la Figure 3 et réciproquement, la Figure 3 correspondant à la coupe selon le plan lli-lll illustré sur la Figure 2. En effet, des premières conduites 46 destinées à relier les injecteursAlso found in this Figure 3 the cylinder head 14 in which extends an injector 26, and the injection manifold 12 which is mounted on the cylinder head 14 through the attachment point 16 which appears here. In addition, the cylinder head 14 is covered with a cylinder head cover 28 which extends towards the stop of the engine 10. The lower part 22 has a free lower edge 30 which extends away from a lower part 31 of the said cylinder head 14. A lip seal 32 is mounted on the said lower edge 30 and it seals the cylinder head 14. The lip of the lip seal 32 being elastically deformable, the seal is retained even when the recuperator 22 is driven in displacement, essentially between a close position and a position separated from the cylinder head, obviously within certain limits. Moreover, the bolt 14 has at least one boss 34 adapted to form the point of attachment 16 and which passes through a recess 36 to the recuperator 22. The edge of this recess 36 is provided at a recuperator * joint 38 which applies tightly around the boss 34. From the boss 34 the recuperator 22 has a portion 40 which extends substantially vertically behind the injection ramp 12, between it and the cylinder head 14 then which continues with a support part 42 , substantially perpendicular to said portion 40. The support part 42 is applied to the injection rail 12 and is joined to it by fixing clips not shown. In addition, the support part 42 has a flange 44 adapted to cooperate with the cover 24 as will be described below. A description will first be given of the cooperation of your support part 42 with the injection ramp 12 on which it rests, with reference to FIG. 3 and to FIG. 2. FIG. 2 corresponding to the section according to the IMI yaw illustrated in Figure 3 and vice versa, Figure 3 corresponding to the section along the plane lli-lll illustrated in Figure 2. Indeed, the first lines 46 for connecting the injectors
26 à la rampe d'injection 12 sont raccordées è cette dernière par l'intermédiaire de raccords 48, au nombre de quatre sur la Figure 2. Les raccords sont réalisés grâce à un embout 50 en saillie verticale au-dessus de la rampe d'injection, lequel embout présente un filetage périphérique sur lequel une bague 52 est adaptée à venir se visser. L'extrémité des conduites 46 est munie d'un épaule ent contre lequel ladite bague 52 est adaptée à prendre appui pour maintenir à force ladite extrémité dans l'embout 50 de la rampe d'injection 12. La partie d'appui 42 présente des trous de passage des conduites 46 dont îes bords 54 sont adaptés à venir s'appliquer dans le pourtour des embouts 50 contre îa rampe d'injection 12 et ce de façon étanche grâce à un joint de rampe 56. Avantageusement, le joint de rampe est réalisé d'une seule pièce et il s'étend sur toute la longueur de la partie d'appui 42 qui elle, longe le récupérateur 22 et des orifices sont ménagés pour chaque. embout 50. Un embout central 57 d'alimentation, apparaissant sur fa Figure 2, est ménagé en saillie de la rampe d'injection 12 et il est destiné à recevoir un conduit d'alimentation provenant d'une pompe d'injection non représentée, et extérieure au boîtier 20. Pour ce faire, le couvercle 24 présente une portion enfoncée non représentée et percée, dont le bord vient s'appliquer de façon étanche autour de f'embout centrai 57. L'embout central 57 est ainsi raccordé à îa conduite d'alimentation en dehors audit boîtier 20 avec des moyens analogues à ceux des autres conduites. Par ailleurs, le couvercle 24 présente un second bord libre 58 qui s'applique, du côté de îa face avant, fongitudinalement contre le rebord 44 de façon étanche grâce à un premier joint de couvercle 60 et du côté de la face arrière, contre le couvercle de culasse 28, de façon étanche grâce à un deuxième joint de couvercle 62. De façon pratique, ledit second bord libre est muni d'un seul joint de couvercle continu, qui est coincé entre le couvercle 24 et le récupérateur 22 sensiblement pour moitié, y compris deux parties de bords latéraux non représentés où se rejoignent le rebord26 to the injection rail 12 are connected to the latter via connections 48, four in number in FIG. 2. The connections are made by means of a nozzle 50 projecting vertically above the rail injection, which end piece has a peripheral thread on which a ring 52 is adapted to be screwed. The end of the pipes 46 is provided with a shoulder against which said ring 52 is adapted to take support in order to force said end into the end piece 50 of the injection rail 12. The support part 42 has holes for passage of the pipes 46 whose edges 54 are adapted to be applied in the periphery of the nozzles 50 against the injection rail 12 and in a sealed manner thanks to a rail seal 56. Advantageously, the rail seal is made in one piece and it extends over the entire length of the part d 'support 42 which it runs along the recuperator 22 and orifices are provided for each. end piece 50. A central end piece 57 for supplying, appearing in FIG. 2, is formed projecting from the injection rail 12 and it is intended to receive a supply duct coming from an injection pump not shown, and external to the housing 20. To do this, the cover 24 has a depressed portion, not shown and pierced, the edge of which is applied in a sealed manner around the central tip 57. The central tip 57 is thus connected to the supply line outside said housing 20 with means similar to those of the other lines. Furthermore, the cover 24 has a second free edge 58 which is applied, on the side of the front face, fongitudinally against the rim 44 in leaktight manner thanks to a first cover seal 60 and on the side of the rear face, against the cylinder head cover 28, in leaktight manner thanks to a second cover gasket 62. In practice, said second free edge is provided with a single continuous cover gasket, which is wedged between the cover 24 and the recuperator 22 substantially for half , including two parts of side edges not shown where the rim meet
44 et l culasse, et entre le couvercle 24 et le couvercle de culasse 28 pour l'autre moitié en incluant les deux autres parties de bords latéraux. De- la sorte, d'une part le récupérateur 22 isole complètement et de façon étanche, la rampe d'injection 12 de îa culasse 14 et d'autre part, le couvercle 24 recouvre entièrement et également de façon étanche les conduites 46 entre le rebord 44 et îe couvercle de culasse 28. Ainsi, toute fuite de carburant au niveau des conduites 48 et particulièrement au niveau des raccords 48 est circonscrite à l'intérieur du boîtier. En outre, le couvercle 24 est monté en position fixe sur îe couvercle de culasse 28 par des vis non représentées tandis que le second bord libre 58 est muni d'ergots 64 apparaissant également sur la Figure 1, adaptés à être engagés dans les lumières 66 de pattes élastiques 68. Ainsi, le couvercle 24 et le récupérateur 22 sont solidaires l'un de l'autre et ils sont adaptés à être reliés aisément l'un à l'autre. De plus, sur cette Figure 1 , on a représenté une pipette d'évacuation 70 dans une partie latérale basse du récupérateur 22 et qui débouche à l'intérieur du boîtier 20 plus précisément entre fa paroi du récupérateur 22 et la paroi de culasse. Grâce à cette pipette d'évacuation 70, îe carburant qui s'échappe des conduites sous forme liquide ou qui est vaporisé, est susceptible d'être récupéré. Compte tenu de l'étanchéitê qui subsiste entre le boîtier 20 dans son ensemble et la culasse 14 toute projection de carburant due à des fuites est d'une part contenue à l'intérieur du boîtier 20 et d'autre part susceptible d'être canalisée et éloignée des parties chaudes du moteur. < 44 and the cylinder head, and between the cover 24 and the cylinder head cover 28 for the other half including the two other side edge parts. In this way, on the one hand the recuperator 22 completely and sealingly isolates the injection ramp 12 from the cylinder head 14 and, on the other hand, the cover 24 completely and also sealingly covers the lines 46 between the flange 44 and cylinder head cover 28. Thus, all fuel leak at the lines 48 and particularly at the connections 48 is circumscribed inside the housing. In addition, the cover 24 is mounted in a fixed position on the cylinder head cover 28 by screws not shown while the second free edge 58 is provided with lugs 64 also appearing in FIG. 1, adapted to be engaged in the slots 66 elastic tabs 68. Thus, the cover 24 and the recuperator 22 are integral with one another and they are adapted to be easily connected to one another. In addition, in this Figure 1, there is shown a discharge pipette 70 in a lower side part of the recuperator 22 and which opens into the housing 20 more precisely between the wall of the recuperator 22 and the cylinder head wall. Thanks to this discharge pipette 70, the fuel which escapes from the pipes in liquid form or which is vaporized, is capable of being recovered. In view of the sealing which remains between the housing 20 as a whole and the cylinder head 14, any projection of fuel due to leaks is on the one hand contained inside the housing 20 and on the other hand capable of being channeled away from hot parts of the engine. <

Claims

REVENDICATIONS
1. Boîtier de protection pour un système d'injection d'un moteur à 5 combustion interne (10), ledit système d'injection comprenant une rampe d'injection (12) qui est alimentée par une pompe et qui est reliée par des conduites â des injecteurs (26) montés dans une culasse (14) dudit moteur, ledit boîtier comportant une paroi dont les bords inférieurs libres (30) sont destinés à joindre de façon étanche ladite culasse (14), w caractérisé en ce que ladite paroi (22,40) est adaptée à s'étendre entre ladite rampe d'injection (12) et ladite culasse (14) en recouvrant lesdites conduites (46) et lesdits injecteurs (26). 1. Protective housing for an injection system of an internal combustion engine (10), said injection system comprising an injection manifold (12) which is supplied by a pump and which is connected by pipes â injectors (26) mounted in a cylinder head (14) of said engine, said housing comprising a wall whose free lower edges (30) are intended to seal said cylinder head (14), w characterized in that said wall ( 22.40) is adapted to extend between said injection ramp (12) and said cylinder head (14) by covering said pipes (46) and said injectors (26).
2. Boîtier de protection selon la revendication 1, caractérisé en ce qu'il comprend une partie inférieure (22) adaptée â former un is récupérateur et une partie supérieure (24) formant couvercle. 2. Protective housing according to claim 1, characterized in that it comprises a lower part (22) adapted to form a recuperator and an upper part (24) forming a cover.
3. Boîtier de protection selon la revendication 2, caractérisé en ce que ledit récupérateur (22) est monté flottant en appui sur ladite rampe d'injection (12). 3. Protective housing according to claim 2, characterized in that said recuperator (22) is mounted floating bearing on said injection rail (12).
4. Boîtier de protection selon îa revendication 2 ou 3, caractérisé 20 en ce que ladite partie inférieure (22) définit une première portion de pa bi de ladite paroi dudit boîtier et présente lesdits bords inférieurs libres (30), et en ce qu'elle s'étend entre ladite rampe d'injection (12) et ladite culasse (14), 4. Protective housing according to claim 2 or 3, characterized in that said lower part (22) defines a first portion of pa of said wall of said housing and has said free lower edges (30), and in that it extends between said injection ramp (12) and said cylinder head (14),
5. Boîtier de protection selon l'une quelconque des 25 revendications 2 â 4, caractérisé en ce que ladite partie inférieure (22) présente des trous de passage desdites conduites et en ce que le bord (54) desdits trous de passage et ladite rampe (12) sont joints de façon étanche par un joint de rampe (56), 5. Protective housing according to any one of claims 2 to 4, characterized in that said lower part (22) has through holes of said conduits and in that the edge (54) of said through holes and said ramp (12) are tightly joined by a rail seal (56),
6. Boîtier de protection selon l'une quelconque des revendications 30 2 à 5, caractérisé en ce que ledit couvercle (24) est monté de manière amovible sur ladite culasse (14) et en ce qu'il joint ledit récupérateur (22) de façon étanche. 6. Protective housing according to any one of claims 30 2 to 5, characterized in that said cover (24) is removably mounted on said cylinder head (14) and in that it joins said recuperator (22) of waterproof way.
7. Boîtier de protection selon l'une quelconque des revendications 2 à 6, caractérisé en ce que ledit couvercle (24) et ledit récupérateur (22) sont adaptés à être reliés ensemble par encliquetage. 7. Protective housing according to any one of claims 2 to 6, characterized in that said cover (24) and said recuperator (22) are adapted to be connected together by snap-fastening.
8. Boîtier de protection selon l'une quelconque des revendications s 1 à 7, caractérisé en ce que lesdits bords inférieurs libres (30) sont équipés d'un joint à lèvre. 8. Protective housing according to any one of claims s 1 to 7, characterized in that said free lower edges (30) are equipped with a lip seal.
9. Boîtier de protection selon l'une quelconque des revendications 1 à 8, caractérisé en ce qu'il comprend une pipette d'évacuation (70) débouchant dans une partie basse.0 9. Protective housing according to any one of claims 1 to 8, characterized in that it comprises a discharge pipette (70) opening into a lower part.
PCT/FR2004/050692 2003-12-23 2004-12-15 Protective housing for an injection system WO2005064146A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE602004025850T DE602004025850D1 (en) 2003-12-23 2004-12-15 PROTECTIVE HOUSING FOR INJECTION SYSTEM
AT04816546T ATE459799T1 (en) 2003-12-23 2004-12-15 PROTECTIVE HOUSING FOR AN INJECTION SYSTEM
EP04816546A EP1700027B1 (en) 2003-12-23 2004-12-15 Protective housing for an injection system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0315310A FR2864171B1 (en) 2003-12-23 2003-12-23 HOUSING FOR PROTECTING AN INJECTION SYSTEM
FR0315310 2003-12-23

Publications (1)

Publication Number Publication Date
WO2005064146A1 true WO2005064146A1 (en) 2005-07-14

Family

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Application Number Title Priority Date Filing Date
PCT/FR2004/050692 WO2005064146A1 (en) 2003-12-23 2004-12-15 Protective housing for an injection system

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EP (1) EP1700027B1 (en)
AT (1) ATE459799T1 (en)
DE (1) DE602004025850D1 (en)
FR (1) FR2864171B1 (en)
WO (1) WO2005064146A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2910073A1 (en) 2006-12-18 2008-06-20 Renault Sas Injector protecting device for internal combustion engine, has screen protection part forming edge on portion of screen fixation part by extending perpendicularly above fixation part so as to cover part of injector
FR2910562A1 (en) 2006-12-20 2008-06-27 Renault Sas Fixation support for fuel injector of internal combustion engine, has mounting plate possessing support fixation unit on bend pipe of engine, and main body housing injector, where part forms protection screen of injector
FR3054859B1 (en) * 2016-08-05 2020-02-14 Peugeot Citroen Automobiles Sa HEAD COVER OF A VEHICLE ENGINE
FR3076579B1 (en) * 2018-01-08 2020-02-14 Robert Bosch Gmbh DEVICE FOR SEALED CONNECTION OF THE HIGH PRESSURE PIPE CONNECTING THE HIGH PRESSURE PUMP TO THE COMMON INJECTION RAMP OF AN INTERNAL COMBUSTION ENGINE

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0612921A1 (en) * 1993-02-26 1994-08-31 Caterpillar Inc. Tuned actuating fluid inlet manifold for a hydraulically-actuated fuel injection system
EP0957260A2 (en) * 1998-05-09 1999-11-17 Perkins Engines Company Limited Fluid feed system
EP1172551A2 (en) * 2000-07-11 2002-01-16 Hino Motors, Ltd. Fuel supply system of diesel engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0612921A1 (en) * 1993-02-26 1994-08-31 Caterpillar Inc. Tuned actuating fluid inlet manifold for a hydraulically-actuated fuel injection system
EP0957260A2 (en) * 1998-05-09 1999-11-17 Perkins Engines Company Limited Fluid feed system
EP1172551A2 (en) * 2000-07-11 2002-01-16 Hino Motors, Ltd. Fuel supply system of diesel engine

Also Published As

Publication number Publication date
FR2864171B1 (en) 2007-08-31
DE602004025850D1 (en) 2010-04-15
FR2864171A1 (en) 2005-06-24
ATE459799T1 (en) 2010-03-15
EP1700027A1 (en) 2006-09-13
EP1700027B1 (en) 2010-03-03

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